The definition string contains the template definition (the static portion of the E-mail), which can make references to outside variables (the dynamic portion).
definition字符串包含模板定义(电子邮件的静态部分)，它可以对外部变量(动态部分)进行引用。
The definition string contains the template definition (the static portion of the E-mail), which can make references to outside variables (the dynamic portion).
definition字符串包含模板定义(电子邮件的静态部分)，它可以对外部变量(动态部分)进行引用。
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